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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/xattr_security.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 * Handler for storing security labels as extended attributes.
4 */
5
6#include <linux/module.h>
7#include <linux/string.h>
8#include <linux/fs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -07009#include <linux/security.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090010#include <linux/slab.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040011#include "ext4_jbd2.h"
12#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070013#include "xattr.h"
14
15static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000016ext4_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
17 const char *name, size_t name_len, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018{
19 const size_t prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
20 const size_t total_len = prefix_len + name_len + 1;
21
22
23 if (list && total_len <= list_size) {
24 memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
25 memcpy(list+prefix_len, name, name_len);
26 list[prefix_len + name_len] = '\0';
27 }
28 return total_len;
29}
30
31static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000032ext4_xattr_security_get(struct dentry *dentry, const char *name,
33 void *buffer, size_t size, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070034{
35 if (strcmp(name, "") == 0)
36 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000037 return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
38 name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039}
40
41static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000042ext4_xattr_security_set(struct dentry *dentry, const char *name,
43 const void *value, size_t size, int flags, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044{
45 if (strcmp(name, "") == 0)
46 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000047 return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_SECURITY,
48 name, value, size, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070049}
50
51int
Mingming Cao617ba132006-10-11 01:20:53 -070052ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070053{
54 int err;
55 size_t len;
56 void *value;
57 char *name;
58
59 err = security_inode_init_security(inode, dir, &name, &value, &len);
60 if (err) {
61 if (err == -EOPNOTSUPP)
62 return 0;
63 return err;
64 }
Mingming Cao617ba132006-10-11 01:20:53 -070065 err = ext4_xattr_set_handle(handle, inode, EXT4_XATTR_INDEX_SECURITY,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070066 name, value, len, 0);
67 kfree(name);
68 kfree(value);
69 return err;
70}
71
Stephen Hemminger11e27522010-05-13 17:53:18 -070072const struct xattr_handler ext4_xattr_security_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070073 .prefix = XATTR_SECURITY_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070074 .list = ext4_xattr_security_list,
75 .get = ext4_xattr_security_get,
76 .set = ext4_xattr_security_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070077};